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PRINCIPAL ACCOUNTING POLICIES - Share incentive plans (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 18, 2021 | Dec. 31, 2022 shares | Dec. 31, 2021 shares | Dec. 31, 2020 shares | Dec. 31, 2019 shares
Share-based compensation disclosures |  |  |  |  |
Number of options granted under share incentive plan |  | 17,311,708 | 15,404,097 | 8,921,248 |
Number of option outstanding under share incentive plans (in shares) |  | 77,474,702 | 66,081,119 | 57,583,856 | 54,368,896
Share subdivision ratio | 8 |  |  |  |
Share based payment award number of common stock issuable on vesting of outstanding stock option ratio | 1 |  |  |  |
Share based payment award number of common stock issuable on vesting of outstanding restricted stock ratio | 1 |  |  |  |
Share based payment award stock options subdivision conversion ratio | 8 |  |  |  |
Share Based Payment Award Restricted Stock Shares Subdivision Conversion Ratio | 8 |  |  |  |
Before Share Subdivision |  |  |  |  |
Share-based compensation disclosures |  |  |  |  |
Ratio of ADSs to ordinary shares | 1 |  |  |  |
Restricted stock units (RSUs) | Employees |  |  |  |  |
Share-based compensation disclosures |  |  |  |  |
Requisite service period |  | 4 years | 4 years |  |
Ctrip 2007 Incentive Plan | Stock options | Employees | After Share Subdivision |  |  |  |  |
Share-based compensation disclosures |  |  |  |  |
Number of option outstanding under share incentive plans (in shares) |  | 14,256,667 | 15,290,480 |  |
Ctrip 2007 Incentive Plan | Restricted stock units (RSUs) | Employees | After Share Subdivision |  |  |  |  |
Share-based compensation disclosures |  |  |  |  |
Restricted stock units outstanding (in shares) |  | 0 | 320 |  |
Global Incentive Plan | Stock options | Employees | After Share Subdivision |  |  |  |  |
Share-based compensation disclosures |  |  |  |  |
Number of options granted under share incentive plan |  | 17,311,708 | 15,404,097 | 8,921,248 |
Number of option outstanding under share incentive plans (in shares) |  | 63,218,035 | 50,790,639 |  |
Global Incentive Plan | Restricted stock units (RSUs) | Employees | After Share Subdivision |  |  |  |  |
Share-based compensation disclosures |  |  |  |  |
Number of options granted under share incentive plan |  | 255,000 | 255,004 | 550,888 |
Restricted stock units outstanding (in shares) |  | 751,506 | 869,300 |  |

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